Word of advice, stay away from aftermarket regulators. A while back I had the same issue with a Polaris super sport. I bought an aftermarket regulator for about 60% of the cost of a new one. Put it on and the bulbs still blew. Looked for a short somewhere, couldn't find anything. talked to the dealer I got it from and he got me another aftermarket one for at no cost. Did the same thing. After looking at every wire and finding no problems, talked to the dealer again and suggested an oem unit. I got that one on and it worked perfect. That was 7 or 8 years ago and it is still working great.
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